The REF601 (Part Code: CE446BB1NH) is a dedicated feeder protection and control relay from the ABB Relion® 605 series. It is designed for protection, control, measurement, and supervision of utility and industrial power distribution systems. This compact numerical relay is primarily used for short-circuit and overcurrent protection in medium-voltage networks, offering a high level of reliability and a user-friendly interface for local operation.

Product Datasheet & Parameters

Product Technical Description

The REF601 CE446BB1NH serves as a vital safeguard for electrical distribution assets. It integrates multiple protection functions into a single hardware unit, reducing the need for multiple discrete components.

Key Functional Characteristics:

• Overcurrent Protection: Features three-stage non-directional overcurrent protection (low-set, high-set, and instantaneous).

• Earth-Fault Protection: Provides sensitive earth-fault detection to prevent equipment damage during insulation failure.

• Measurement Capabilities: Real-time monitoring of phase currents and earth current, accessible via the front HMI (Human Machine Interface).

• Fault Recording: Stores trip data and fault current values for the last five events, assisting in rapid post-fault analysis.

• Self-Supervision: Continuous internal monitoring of hardware and software integrity; an internal watchdog triggers an alarm if a system fault is detected.

Country of Origin

• Original Country: India (IN) / Estonia (EE)

• Manufacturer: ABB Distribution Solutions

Common Questions & Answers (Q&A)

Q: What does the "CE446BB1NH" code specify?A: This specific hardware configuration code defines the auxiliary power supply range, the number of binary inputs/outputs, the communication protocol (Modbus), and the physical casing type.

Q: Can this relay be used for motor protection?A: While the REF601 is optimized for feeders, it can provide basic overcurrent and earth-fault protection for motors. However, for specialized motor protection (like thermal overload or locked rotor), the REM601 variant is typically recommended.

Q: Is the communication port isolated?A: Yes, the RS-485 communication port used for Modbus RTU is galvanically isolated to ensure data integrity and protect the relay from surges on the communication bus.

Q: How do I reset a trip condition on the REF601?A: Trips can be reset locally using the "RESET" button on the front panel HMI once the fault has been cleared, or remotely via the binary inputs or communication link.